BEIJING, March 24 (Xinhua) -- Fish fossils, dating back about 425 million years ago, are providing insights into the evolution of scales on bony fishes. Diversified scales are one of the most obvious exterior characteristics of fish and they can be distributed in different areas of a fish in...
Fifteen years have passed since the publication of a novel approach for sequencing the whole mitochondrial genome (mitogenome) of fishes (ca. 16,500 bp) using a combination of the long PCR technique (Cheng et al.1994) and a number of fish-versatile primers (Miya and Nishida1999). During ...
we investigate evolutionary changes when genome regions become completely sex-linked, by analyses of multiple species of flatworms (Platyhelminthes; among which schistosomes recently evolved gonochorism from ancestral hermaphroditism), and roundworms (Nematoda) ...
Research on the evolutionary history of menopause has been constrained because menopause is a rare taxonomic trait in wild populations. In primates, for example, the scope for robust comparisons is limited because menopause has only evolved once and humans are unusual among primates in key aspects o...
Further, the frequency distributions of sizes among fish lineages resemble those of most other animal taxa, in being right-skewed, even on a log scale. Using an approach that measures rates of size evolution (in darwins) within a formal phylogenetic framework, we interpret the shape of size ...
Overall, most previous comparative analyses on the evolution of fish genome sizes have been either entirely focused on ray-finned species or strongly biased toward them, showing contrasting results across ecological gradients. Therefore, the suggestion that the larger genomes found in chondrichthyan rel...
In addition to insights into adaptation to a benthic lifestyle, we find that the sex chromosomes of these fish are derived from the same ancestral vertebrate protochromosome as the avian W and Z chromosomes. Notably, the same gene on the Z chromosome, dmrt1, which is the male-determining ...
Fish are aquatic animals; they are identified as vertebrates that have gills and fins instead of limbs. The majority of fish have streamlined and generalized bodies. Another fact is that fish do not chew their food because it would obstruct the passage of water through their gills, and if the...
Cnidarians are astonishingly diverse in body form and lifestyle, including the presence of a jellyfish stage in medusozoans and its absence in anthozoans. Here, we sequence the genomes of Aurelia aurita (a scyphozoan) and Morbakka virulenta (a cubozoan) to understand the molecular mechanisms ...
Transposable elements (TEs) are genomic sequences that can move, multiply, and often form sizable fractions of vertebrate genomes. Fish belong to a unique group of vertebrates, since their karyotypes and genome sizes are more diverse and complex, with probably higher diversity and evolution specific...